Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 8030937 | Multiple frequency based leakage correction for imaging in oil based muds Oil-based mud imaging systems and methods having leakage current compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least ... | 10/04/2011 |
| 7888941 | Permittivity measurements with oil-based mud imaging tool Oil-based mud imaging systems and methods that measure formation permittivity. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least ... | 02/15/2011 |
| 7746078 | Method and system of calculating resistivity of an earth formation Calculating resistivity of an earth formation. At least some of the illustrative embodiments are systems including: a first current source current return (CSCR) pair, said first CSCR pair comprises a first current source and a first current return, the first current... | 06/29/2010 |
| 7696756 | Oil based mud imaging tool with common mode voltage compensation An apparatus and method for minimizing the effects of a common mode voltage signal in downhole logging tools utilized to determine the resistivity of an adjacent portion of a borehole wall. Two current electrodes are energized by an excitation source to create an os... | 04/13/2010 |
| 7579841 | Standoff compensation for imaging in oil-based muds Oil-based mud imaging systems and methods having standoff compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two vol... | 08/25/2009 |
| 7545145 | Method and apparatus for tensorial micro-resistivity imaging in oil-based muds An unfocused resistivity imaging device horizontal and vertical currents conveyed into the borehole. Pad mounted electrodes are used to make voltage measurements in orthogonal directions. The voltage measurements are then rotated to give principal resistivity measur... | 06/09/2009 |
| 7388380 | While-drilling apparatus for measuring streaming potentials and determining earth formation characteristics and other useful information Logging-while-drilling apparatus and methodologies for measuring streaming potential in an earth formation are provided. The apparatus and methodologies can be utilized to find information relevant to the drilling operations. In particular, since the streaming poten... | 06/17/2008 |
| 7322410 | Controllable production well packer An apparatus and method for operating an electrically powered device in a packer using the piping structure of the well as an electrical conductor for providing power and/or communications. The electrically powered device may comprise an electrically controllable va... | 01/29/2008 |
| 7259688 | Wireless reservoir production control A reservoir production control system includes a plurality of wells for producing a reservoir linked to a central computer over a downhole communication network and a surface communication network. Both the downhole and the surface communication networks are wireles... | 08/21/2007 |
| 7256582 | Method and apparatus for improved current focusing in galvanic resistivity measurement tools for wireline and measurement-while-drilling applications A galvanic resistivity tool with one or more measurement electrodes and guard electrodes, and one or more shielding electrodes. The potential difference between the measurement electrodes and the guard electrodes is controlled to minimize current flow between the me... | 08/14/2007 |
| 7242194 | Formation imaging while drilling in non-conductive fluids A resistivity tool for investigating a wall of a borehole drilled with a non-conductive mud includes a tool body adapted to be incorporated in a logging-while-drilling tool assembly; a resistivity sensor disposed on the tool body, wherein the resistivity sensor comp... | 07/10/2007 |
| 7236886 | Multiscale multidimensional well log data inversion and deep formation imaging method Different subsets of multiarray resistivity measurements are inverted using a corresponding resistivity model. The models are selected based at least in part on the resolution of the measurements. Results of the inversion are combined to give a single model consiste... | 06/26/2007 |
| 7183778 | Apparatus and method to measure fluid resistivity An apparatus for measuring fluid resistivity includes a flow line adapted to be in fluid communication with formation fluids, wherein the flow line includes a first section comprising a first conductive area, a second section comprising a second conductive area, and... | 02/27/2007 |
| 7150188 | Non-invasive measurement of fluid-pressure diffusivity using electro-osmosis An apparatus for determining fluid-pressure diffusivity in a borehole (12) in a formation (10) includes an electrode (16) and a strain measuring device (18),(20) (or a particle velocity measuring device (18),(20) or a... | 12/19/2006 |
| 7148693 | Process and device for prospecting a porous geological formation A porous geological formation contains electrolytic fluid. During the geophysical prospecting of the formation, a region of interest of the formation where the electrolytic fluid is found is stimulated with an excitation signal. The excitation signal corresponds to ... | 12/12/2006 |
| 7147059 | Use of downhole high pressure gas in a gas-lift well and associated methods A gas-lift petroleum well and method for producing petroleum products using downhole pressurized gas to provide lift. The gas-lift well having a well casing, a production tubing, a packer, and a gas-lift valve. The well casing extends within a wellbore of the well, ... | 12/12/2006 |
| 7119544 | Method and a tool for electrically investigating a wall of a borehole in a geologic formation A method for electrically investigating a wall of a borehole in a geologic formation including injecting a current into the formation at a first position along the wall and returning the current at a second position along the wall, the formation current having a fre... | 10/10/2006 |
| 7109719 | Method and apparatus for azimuthal resistivity measurements in a borehole An azimuthal resistivity logging tool includes one or more pads for making azimuthal resistivity measurements of earth formation. Current from the pads, guard electrodes and a measure electrode are measured while monitoring the voltage difference between pairs of mo... | 09/19/2006 |
| 7098664 | Multi-mode oil base mud imager A multi-mode oil base mud imager for use in non-conductive drilling fluid includes at least one current source—a current return pair, and one or more monitor electrodes not located between the current source and the current return of the current source-current ret... | 08/29/2006 |
| 7073594 | Wireless downhole well interval inflow and injection control An apparatus and methods of electrically controlling downhole well interval inflow and/or injection. The downhole controllable well section having a communications and control module, a sensor, an electrically controllable valve and an induction choke. The electrica... | 07/11/2006 |
| 7075454 | Power generation using batteries with reconfigurable discharge A petroleum well for producing petroleum products that incorporates a system adapted to provide power to a downhole device in the well. The system includes a current impedance device and a downhole power storage device. The current impedance device is positioned suc... | 07/11/2006 |
| 7071837 | Data transmission in pipeline systems Data transmission in pipeline systems A first set of apparatus is arranged for transmitting data from a point in a cased section of a well 1, 3 to a remote location. The apparatus may be used as a relay station 6 to increase operational depth. Signals ... | 07/04/2006 |
| 7071697 | Centralizer including measurement means A centralizer (1) for position a casing (3) in a conduit (4) passing through underground formations includes measurement means (7) such as an electrode for deriving at least one representative parameter of the formations. ... | 07/04/2006 |
| 7066282 | Apparatus and methods for measuring formation characteristics in presence of conductive and non-conductive muds Tools for investigating an earth formation in the presence of either oil-base or water-base mud include a circuit which induces current into the formation in a focused manner, and a sensor electrode which is isolated from the circuit, at least partially surrounded b... | 06/27/2006 |
| 7055592 | Toroidal choke inductor for wireless communication and control An induction choke in a petroleum well where a voltage potential is developed across the choke to power and communicate with devices and sensors in the well. Preferably, the induction choke is a ferromagnetic material and acts as an impedance to a time-varying curre... | 06/06/2006 |
| 7042225 | Apparatus and methods for induction-SFL logging A well logging tool includes an induction array stack disposed on a mandrel; an electronic module stack disposed adjacent the induction array stack along a longitudinal axis of the well logging tool; and a shallow electrode array arranged on a housing disposed aroun... | 05/09/2006 |
| 7034539 | Underground exploration apparatus, system and method The object of the present invention is to realize a low-invasive underground exploration apparatus, system, and method which are capable of specifying the kind, three-dimensional position, and amount of a substance present in the ground. The underground exploration ... | 04/25/2006 |
| 7027967 | Method and system for indicating anisotropic resistivity in an earth formation A system and methods for indicating formation resistivity anisotropy and evaluating the vertical resistivity component by combining array induction measurements and array laterolog measurements. Formation measurements are obtained with an induction tool and a latero... | 04/11/2006 |
| 7026820 | Method and apparatus for minimizing direct coupling for downhole logging devices A method and apparatus for minimizing direct coupling between transmitters and receivers on a downhole logging tool are disclosed. One embodiment includes a transmitter, a bucking device, and a plurality of receivers, where signals may be directly coupled from the t... | 04/11/2006 |
| 6968735 | Long range data transmitter for horizontal directional drilling An apparatus for monitoring conditions in subterranean borehole during drilling and pullback operations in real time. The apparatus includes a drill string having a working end. A measurement system suitable for measuring at least one operational characteristic of t... | 11/29/2005 |
| 6956376 | Devices for characterizing a multiphase fluid having a continuous conductive phase A device for determining the mean resistivity of a multiphase fluid having a continuous conductive phase, includes a pipe segment (4) of insulating material and a oil (6) for generating an electric current in the fluid flowing along the pipe. The devic... | 10/18/2005 |
| 6950749 | Method for resistivity anisotropy determination in near vertical wells A method is disclosed for real-time (well-site) resistivity anisotropy determination using array lateral logs or any other unfocused, lateral-type measurements, and array induction logs or any other focused, induction-type measurements. Near-vertical wells with a de... | 09/27/2005 |
| 6927578 | Detection of borehole currents due to a decentered transverse magnetic dipole transmitter The invention provides an apparatus for making an electromagnetic measurement from within a subsurface borehole. The apparatus comprises an elongated support having electrically conductive segments and adapted for disposal within the borehole; an antenna adapted to ... | 08/09/2005 |
| 6925384 | Method for resistivity anisotropy determination in conductive borehole environments A method for determining formation resistivity anisotropy in a wellbore environment. The method of the present invention effectively extends the dynamic range of the existing well logging service of the multi-component induction tool, allowing the use of this servic... | 08/02/2005 |
| 6919724 | Method and apparatus for investigating the wall of a borehole The present invention relates to a method of investigating the wall (2) of a borehole in a geological formation by means of two injectors (4, 5) with a potential V being applied between them and in measuring the potential difference δV between two ele... | 07/19/2005 |
| 6906535 | Method for characterizing water-in-oil emulsions using electrical wave forms A method is provided for characterizing emulsion stability to evaluate suitability of the emulsion for use as a drilling fluid in drilling subterranean boreholes. The method provides a supplement or alternative to the standard method of determining Electrical Stabil... | 06/14/2005 |
| 6839000 | Integrated, single collar measurement while drilling tool An integrated, single collar measurement while-while-drilling tool is presented that comprises formation sensors, directional sensors, pressure sensors, a mud pulse telemetry device, and a turbine-generator power device configured in a single collar housing that is ... | 01/04/2005 |
| 6765387 | System and method for measuring resistivity through casing The present invention is a system and method capable of providing continuous measurements of resistivity-through-casing (RTC) of a geological formation traversed by a boreholeby eliminating measurement of the casing resistance. To this end, a real-time feedback cont... | 07/20/2004 |
| 6670813 | Integrated borehole system for reservoir detection and monitoring A method is disclosed for generating an image of earth formations penetrated by a wellbore. The method includes generating an initial model of the earth formations using formation resistivity measured by a direct current signal. A response to the initial ... | 12/30/2003 |
| 6591673 | Methods for identifying fluid types of underground formations A method of identifying the fluid type of subterranean formations according to the correlation between the variation trend of electrical resistivity with depth downhole in a borehole and the variation trend of porosity with depth downhole in the same bore... | 07/15/2003 |
